The problem with new techniques is that, being new, they are (1) hard to find and (2) more expensive. Combine that with miserly dental insurance and it's hard for advances to get traction.
I actually have an example of this from my own life. I grind my teeth while I sleep, apparently, and since none of the dentists I saw during the first 30 years of my life ever figured that out (grr) my teeth are pretty ground down. These days I wear a dental appliance while I sleep to reduce the damage, but it is only a case of "reduce", not "prevent." The teeth are still getting worse, just not quite so fast.
The word I'd gotten from several dentists was that this was as good a solution as I could realistically hope for. But last year I switched to a new dentist, and when I was telling him all this his eyes got all big, like I was telling him that the plan had been to drill a hole in my head to let out the Evil Spirits. Modern dentistry, he told me, actually had a way to stop the grinding altogether using a course of mild, painless electrical stimuli. Do a few rounds of that, he said, and it'd be problem solved.
Which sounded great! Except that my dental insurance refused to cover even one dollar of such a procedure, which meant it would have cost me about as much out of pocket as a small car. And I, being a layman, have no way to tell if this one dentist is really right, or if all the other ones were and this one is peddling snake oil. So I ended up not doing it, out of fear of a worst case scenario where I went broke paying for treatments that didn't actually do anything.
This outcome is sub-optimal for everybody -- even the health insurance company, since the more I grind my teeth down the more often they'll end up having to pay for extractions, root canals and the like as the teeth crack and fail. But combine lack of information with high costs and change-averse insurance, and it's difficult to see how you get to any other outcome.